Decode in-memory PNG/JPEG data to Image

[flozf]

Thanks for helping me with all of my questions regarding Slint.
Instead of another question, I'd like to contribute a small code snippet I came up with, which might be useful for others.

There is no function to decode an in-memory image file to an Image object.

This is my solution:

use slint::SharedPixelBuffer;

pub fn load_image_from_memory(bytes: &[u8]) -> image::ImageResult<slint::Image> {
    let img = image::load_from_memory(bytes)?;

    if img.color().has_alpha() {
        let rgba8image = img.to_rgba8();
        let buf = SharedPixelBuffer::clone_from_slice(&rgba8image.as_raw(), rgba8image.width(), rgba8image.height());
        Ok(slint::Image::from_rgba8(buf))
    } else {
        let rgb8image = img.to_rgb8();
        let buf = SharedPixelBuffer::clone_from_slice(&rgb8image.as_raw(), rgb8image.width(), rgb8image.height());
        Ok(slint::Image::from_rgb8(buf))
    }
}

You have to add a dependency to image to your Cargo.toml, e.g.

image = { version = "0.25.9", optional = true, default-features = false, features = ["png", "jpeg"] }

Because Slint uses this crate too, the binary size should not increase much. (At least as long as you use the same version as your Slint library.)